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| const d3 = require("d3"); | |
| const MersenneTwister = require("mersenne-twister"); | |
| const generator = new MersenneTwister(); | |
| /* | |
| generate random attempts at playing a correct sequence of notes, | |
| given a range of midi (note) and duration options | |
| */ | |
| function generateAttempts({ range, sequence, iterations }) { | |
| const answer = sequence.map(d => `${d.midi}-${d.duration}.`).join(""); | |
| const { midis, durations } = range; | |
| midis.sort(d3.ascending); | |
| durations.sort(d3.ascending); | |
| const mL = midis.length; | |
| const dL = durations.length; | |
| // this is where the magic happens (ie optimization needed) | |
| const makeAttempt = () => { | |
| const seq = sequence.map(() => { | |
| const mR = midis[Math.floor(generator.random() * mL)]; | |
| const dR = durations[Math.floor(generator.random() * dL)]; | |
| return [mR, dR]; | |
| }); | |
| const a = seq.map(d => `${d[0]}-${d[1]}.`).join(""); | |
| done = a === answer; | |
| return { seq, done }; | |
| }; | |
| const output = []; | |
| let i = 0; | |
| while (i < iterations) { | |
| // store the 1000 most recent attempts | |
| const a = makeAttempt(); | |
| output[i % 1000] = a; | |
| if (a.done) break; | |
| i += 1; | |
| } | |
| return { output, done, attempts: i }; | |
| } | |
| function init() { | |
| // INPUT | |
| const range = { midis: [73, 64, 66, 74], durations: [1, 2, 3] }; | |
| const sequence = [ | |
| { midi: 73, duration: 1 }, | |
| { midi: 64, duration: 2 }, | |
| { midi: 66, duration: 3 }, | |
| { midi: 66, duration: 1 }, | |
| { midi: 74, duration: 2 }, | |
| { midi: 73, duration: 2 }, | |
| { midi: 66, duration: 1 } | |
| ]; | |
| const iterations = 1000000; | |
| const result = generateAttempts({ range, sequence, iterations }); | |
| } | |
| init(); |
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